US1683582A

US1683582A - Typewriting machine

Info

Publication number: US1683582A
Application number: US41933A
Authority: US
Inventors: Burnham C Stickney
Original assignee: Underwood Elliott Fisher Co
Current assignee: Underwood Elliott Fisher Co
Priority date: 1925-07-07
Filing date: 1925-07-07
Publication date: 1928-09-04
Anticipated expiration: 1945-09-04
Also published as: GB254169A

Description

Sept. 4, 1928. 1,683,582

B. c. sTlcKNEY TY'PEWRITING MACHINE Filed July 7, 1925- Hy. j.

Patented Sept. 4, 1928.

UNITED .sTATEs BUBNHAM.' C. STICKNEY, 0F PORTSMOUTH woon ELLIOTT FISHER coMANY, or wenn y y NEW Harrrsirmnnssxenon To UNDER- NEW YORK, N, Y., conronnmr'oly or DELA` TYPEWBITIN G MACHINE.

Application led July 7J` 19,25. Serial No. 41,933.

This invention relates to line-feeding mechanism fortypevvriting machines` VMany of the features are especially'usefiil in conneetion with revoluble platens.

One of the features of the inventionis the provision of a simple and vpracticable, linefeedingr mechanism `which ivill permit not only single, double and triple linespacing, :for the nsualpnrposes, but which will also permit additional regulation for the intermediate or fractional positions of 11/2 and 2% line-spaces, thus giving` a range of live possible line-space movements, instead of the nsnal three. Y

Another feature of the invention isV the provision of simple means suitable for adoption as standard for regular use, for effecting minute variations inthe extent of the` lines acing movement. `It is a'further object of t e invention to accomplish this result While permittingf the platen stroke to be regularor either l. 11/2, 2,21/2 or 3 times the distance or basis that'is determined by the tine regulation, bnt Without losingsuch ne regulation. In other Words, itis an objectto enable the operator. to determinel by micrometer mechanism the basis for line-spacing, then toree'iilate the number of spaces (multi-` ples of saidfbasis) through which the platen is )to bespaced, with provision for the half -or fractional spaces already mentioned.

An additional 4feature is the provision of means for effectingrfine adjustmentsof Vthe platen to adjust theivorlcsheet to exact printing position, as, for example, in `typingr upon ruled lines. This is done Without altering the micrometer adjustmenti Anotherbbject of the invention is to make it feasible to dispense with the complicated mechanism which usually releasably connects .the platen :to the ordinary line-space Wheel; and still another object` is to 'dispense with the use ofthe device ,which 1.15115 ally throws off the line-space detent and applies a brake ltothe platen.`

To grain vthese and other advantages, there is provided for the platena driving rack, which is illustrated in the form of a Wheel; and meshing with this Wheel is a "worm, rota tion of which effects line-feeding of the platen; the Worm being` constantly in mesh with the worm-Wheel durine; the line-feeding movements. For drivingr this Worin by the usual carriageretnrning handle, a pinion is V.ily een:wantedy to :the Worin, .and il andV fine paivl-and-ratchet or other snit-able uni- V \f'ersalV clutch mechanism to permit the'rrack to return idl.l to normal position, and then to drive the platen from any positionl thereof. A micrometer adjnstmentis provided for det-ermining` Ythe basis ofA the line-spacing movements, so that said basis, Whose nsual minimum is oneeighth of anfineh, may be varied to anyl extent Within a large range.V Said basis havingr been determinechan additional orinnlti-space regulating Stop mechanism is `set independentlyto 'diiierent me? chanieally-located stations, to Adetermine Whether theplaten shallrotate l, 1%, 2, 21/2 I er 3 times the extent-'determined bvSaid basis. VThis multi-space regulation effected Without altering or losing the adjustment that has been effected by @the micrometer mechanism. Each ladjustment may be Veffected illdependently ofthe other; one adjustment beiner preferably at one end of the `stop train, and the other adjustment at the other 'end` or intermediate` the line-space handle and ,the train.

The Worm may be 'provided with a thumb? Wheel,l whereby it may be independently rotated for Iefect-inrr'ine adjustment of `the platen upon special occasions, `as,rfr`or exfample, when bringing a ruled Work-sheet to exact typingr position. It Will be nnderstood that the liuefspace mechanism .will pick. up the platen from any position thereof, makingit lnnnecessary to attend to `the disconnecting and re-connectingr of the line-spacing mechanism or platendetent-mechanism as heretofore. There is nothing to, do but to `notate the platen to hrinnthesheet to typing;f posi` tion, and afterthat to'simply operate the line-spacing handle for the usual purpose.

"A 'further advantage gained is that the platen, since its linees'pace movement is alwaysv .or nearly always an aliquant part oa revolution,V does .not become indented by rea-- son of the types repeatedly striking in the same places.` i l "Inthe development of the present inven? tion, the platen is rotated impair of spiralV ,aille la rear thereof being; d to and the smaller gear or pinion formed with a spindle to carry a ratchet toothed element, forming one part of a two-part interlocking clutch, the two parts thereof being normally separated and inoperative, but are brought into operative relation by the initial movement of the line-space lever. The second clutch-element thereof carries a pinion driven by a gear-sector pivoted on the frame and j operated by a bar connection to one arm of a bell-crank pivotally secured to the line-space lever and adjustable thereto. This whole mechanism isassembled outside the'carriage end frame, where adjustment may be made without dismantling the platen from the carriage.`

Interlocking ratchet-toothed-elements are employed as a clutching medium between the line-spaee lever and the platen, forming a oneway drive. To avoid overthrow of the platen and to avoid placing the fine interlocking teeth of the clutch-members under undesirablestrain, the inventionprovides upon the sector (that drives a pinion secured to the movablecluteh-member) a stop-element to arrest the stroke ofthe line-space lever by striking the face ofthe pinion. There is also provided a 'filler-block timed to enter a gap in the top face of the movable clutch-member, at the completion ot the line-spacing movement of the platen, which, by filling up the space between the bottom of the gap and the under face of the supporting frame, effectively locks the movable clutch-element against rising out of engagement kwith its associated clutch-element that is connected to the platen, and overthrow of the platen is prevented.

The line-space lever being mounted upon the carriage-frame, and the line-spacing stop being on the lightplaten-frame, more or less torsional stress will be transmitted to one end of theplaten-frame relativelyT to the carriage, at' each line-spacing operation. To avoid faulty operation from this cause, a support on the `vcarriage 1s' arrangedto bear against a part of the platen-framek in such a manner as not to interfere with the case-shifting movement of 'theplatem but so as to effectively check'any rearward distortion of the lightl and weak platen-frame during a line-spacing operation that might effect the tine, close adjustment of the co-operating clutch-members, etc.

Another feature of the present invention provides for the factory assembly and adjustment of the platen-driving and complicated interlocking clutch-elements within a `retaining bracket or frame that can be attached to the platen-frame as a complete unit. Other features and advantages will hereinafter appear. j

In the accompanying drawings, Figure 1 is a plan view of the line-spacing mechanism,` assembled to the left-hand Car riage end of an Underwood machine, show ing the several parts in operative relation for a line-spacing movement, with some of the parts broken away to expose other parts underneath. Y

Figure 9. isan end view of Figure 1, with some of the parts broken away and others omitted. j

Figure 3 is a cross-sectional view through Figure 1 on a plane indicated by the line 3-3 and looking in the direction of the arrows.

Figure 4. is a fragmentary plan viewillus trating the manner of arresting the line-spa ing lever at the end of its stroke, and also showing in section the element carried by the gear sector, to lock the platen-clutch members at the end of a line-spacing movement.

Figure 5 isa side view of the parts shown in Figure 4, looking in the direction of the arrow.

The usual Underwood cylindrical platen 10 is secured to a platen-shaft 11, journaled in the ends of a platen-frame 12, suspended at each end upon arms 1'3 pivoted at 14 to the carriage-frame 15 to provide an up-and-down shift movement of the plateirframe within the carriage-frame for typing upper and lower case characters.

The invention is illustrated in connection with an Underwood front-strike typewriting machine, in which the revoluble platen 10 is provided with a worm-wheel 49, and in mesh therewith is a worm 27. which is revolved intermittently by means of a line-spacing and earriage-returning lever 51 mounted upon the typewriter-carriagc 15. Said line-spacing lever has a part which performs the function of ashort transmitting arm, which is connected by a link 57 to rcciprocatory means for imparting movements to said worm 27.

Said short arm has an adjustable device for' varying the ell'eetive length of the arm, whereby variations may be effected in the length of the line-spacing unit. Said reciprocating means may include a sector 41, and a pinion 110 meshing therewith and rotated to and fro thereby. This pinion in turn drives one member of a clutch, the companion member 30 being fixed to said worm 27 to drive the Sallie. The clutch may be normally open, Figure 2, but it is automatically closed at the initial portion of the movement ol said linespacine lever 51, so as to drive the worm-wheel and platen.

The driving stroke of the line-spacing lever is limited by the act of throwing a stop or check-dog 4S into the pinion 40; but'upon its return to normal position, the line-space lever is arrested by an adjustable line-space regi ulator, whereby there is secured a multiple spacing, that is, one or ymore line-spacing units (including 1,1/2 and 21/2 line-spaces), without disturbing the setting of micrometer mechanism which is carried by said short arm of said line-spacing lever.

l l (l 12in i Sii Lil)

The worm, clutch and pinion,` etc., are mounted eompactly upon a bracket or frame 16 forming ailmanufacturing unit2 and for convenience the details of this unit will he` first described. This bracket may be formed from sheet-metal to include a top 17 and a bottom 18, the two joined by a strap or yoke 19. The top 17 is secured by screws 20V tothe lett-hand carriage end. The bottom 18 has an ear 21 to further secure the frameito the carriage by a screw 22 threaded into the end of a stud 23 that hangs upon the forward end of one of the arms 13.

r Y The two sections'17 and 18 may be provided with bosses 25 to provide bearings for vertically disposed spindle or shaft 26.' The spindle 26 may `be formed integral with the platen-driving spiral pinionor worm 27, the end facejthereot' hearing against the-upper face of the frame section 18, and to prevent displacement thereof a screw Q8 may be threaded `into the loweriend of the shaft. `The upper end of the pinion 27 may be shouldered down and a clutch-member 2S) secured thereto in any suitable manner to rotate with the pinion or worin 27, This member 29 flares outwardly above the worm 27, to afford an enlarged diameter of the clutch, and this face maybe recessed centrally to form the outer annular. rim 30 throini'h which .rather fine, radial ratchet-teeth may becut. VMore teeth may be employed because of `the enlarged diameter., and each tooth means less angularmovement, thus approximating a (i Il universal friction clutch `in iineness of regula-v tion of the line-spacing movements of the platen. This member 29 is turtherrecessed to forma retainingchamber 31 for a `clutch spring, as will presently appear. Making the worm orspira] `pinionff' separate from the clutch-member 29y is preferable, because it i provides that said clutch-member may be hardened to increase the effective life of the fine, sharp-pointed teeth thereon,` `while the pinion'andshaft'mayfunction better in a somewhat softer state. @ne clutch-member (29) may be permanently fixed to the pinion 2T and to shaft 26, but `the tio-operating or driving .clutch-member 32 will be hereinafter `referred to as the loose clutch-member, ina-smuch as it is loosely mounted on the shaft 9.6

and has sliding and rotary movements independent of the fixed clutch-member 29. It will be understood that the loose clutch-mein- `bei receives its driving movement `from the pinion 40 connected thereto, said pinion beingr driven by the sector 41, which receives its movement through link 57 on the line-spacing lever onheil-crank including the handle ,51, and it will be presently seenthat as the handle starts it `causes the clutch to close,

i and thereafter the platen is rotated by means of `the worm 27 and worm-wheelt9ci through-- out the remainder' of the stroke of `the handle 51 unt-il the stop-tooth or `checir-dog which comprises the sector, pinion, clutch and worm-wheel. it will `be noted that the loose clutch-member 32 includes a dislr equal y in diameter to the fixed member' 29 and recessed on the lower face to forman annular rim through which .fine radial ratchet teeth arecut. The teetli ol the two clutch-members are cut in right and left hand relation for an'interlocking co-operation to form a one-way drivin nj mechanism, butoperate as a ratchet escapement in the return direction.-

lt is tie fable to provide a longv bearing for the loose clutch-m einher 32 upon the shaft` 26, and said member includes a sleeve '33 that eirtends downwardly within the chamber 31,

and is nornially held in a raised position where the tceththereotI stand clear of lthe teeth ot the need clutch-memberQQ bya spiral spring` 311: efunpressed between the bottom of lthe chan 1.1er 31 and the under face ot' the member 32. The spring` serves partly as a drap; toprevent rotation of the member 32 independently oi the shaft Q6 and the member 2 'for purposes presently to appear.

This prevention of rotation of member 32 isV desirable at the initial portiimoiI the driving stroke ofthe line-spacing handle 51, soL that the loose elutch-n'ien'iber will descend properly into mesh with the fixed clutch-member, so as to prevent the upper clutch from slipping aroundand skipping the teeth of the lower clutch, it being' desired to secure a full line-space movement of the platen.

The upper face of the loose member may be recessed centrally to torni an annular rim and twoopen raps or cavities 235 are cut throi'igrh the rim diametrically opposite each other and 'formed to provide caniniing iaces 3G. and adjacent one of these cam recesses a third gzip 37 is cut through the rim to co-act Vwith a clutch-locking element present- -ly to be described.

The details oi? the means for securingr the automatic closing of the clutch at the beginning ofthe operationA oi thepline-spacing handle 51 will now be described. The loose clutch-member 32 normally is tree -to rotate 1 independently oli the iii-:cd cliitch-member 29 through the lifting action oi 'the spring 3a, and to bring` the two clutch-members into cooperation, a disk 88 is loosely mounted upon the shaft 26 to normali;7 lie dat against the ionic )er the cam-cavities and engage with the deepest end thereof. To rotate the disk 3S, the pinion is secured thereto to till the space on the spindle between the disk and the bracket section 17, and the pinion may be rotated by the gear sector 41 :tulcrumed to the under face of the bracket section 17 upon a stud 42 and held thereon by a check-nut 43.

TWhen the parts are conditioned as shown at Figure 2, the pinion may rotate the disk 3S in a counter-clockwise direction. The loose clutch-member 32 may be provided with a slight resistance or drag to prevent a free rotation thereof, so that the two pins 3i) will climb the stationary inclined faces 3G in said loose clutch` and torce the loose clutch-member promptly downward, so that the teeth on the under side thereof engage with the teeth on the top side ot the lived4 clutch member 29,-and when this interlockbetwecn the teeth isy complete, the twopins 39, resting upon the inclined faces 3G of the cavities 35, will become driving elements to rotate the clutch and spindle.

The teeth ot the two elutelrmembers are very fine and have a ratchet or saw-tooth formation,v and while this is the preferred form for a one-way driving transmission, it will be apparent that with the clutch-locking element presentlyT to be described any other formot tooth will be equally effective.

The spring 34: within the chamber 31 performs a double function, that ot' norn'ially holding the clutch open, and also serving as a drag to oppose premature rotation et the loose member 32 at the start of the line-space handle 51. The spring 3a primarily raises the loose clutch 32 out ot engagement with the lower member 29,and aids also in opposing said premature rotation of 32. To further oppose such premature rotation, member 32 is formed with a knurledy periphery, as

" shown; and a brake, preferably in the form ot a pad 44, bears against this roughcned surface at all times, under the pressure ot-a tiat spring or bow 45, to one end of which the pad is secured. The other end o" the spring or bow 45 is secured to the rigid inner wall of an inverted cup-shaped cover-'piece 46, that may be permanently secured to the under tace ot' the section 17, as by rivets 17. In this manner the drag against the loose member 32 is made effective. sition to be overcome during the downward movement of the loose member 3:2 is reduced to a minimum through the employment of the very light springr 311. From this it will be evident that upon the start of the handle 51, the pins 39 swing against the cams 3G, cammina downwardly the loose clutch member with little, it any, premature rotation thereof, thus closing the clutch at once; such premature rotation being opposed by the pad it aidedv by the vertical scores 39., which, because of their vertical arrangement, do not cti-operate The tension or oppowith the pad 4.4 to op )ose seriously the dcscent ot the clutch-memlber, but do co-operate therewith to oppose premature rotation ot said clutch member. It will also be seen that.

after the clutch is closed, the handle 51 a line on the worksheet to the usual platenf scale (not shown) this device enabling the operator to bring the sheet at once to correct typing' position; and whereverthe sheet is brought, the linespacing;r movements begin from that point, without further adjustment at any time, and without any further settingr of any devices. This device 26a is also an advantage in writing fractions and exponents and in other places where it is desired to write a numeral or character a little above or a little below the line ot writinef.

'l'here will now be described the device which arrests the line-spacing train at the completion ot the drive ot the handle 51. T he toothed sector 41 has stop-member 48 formed therewith to limit the movement of the ser-tor in its driving direction'to line-space the platen, by striking the face of the pinion 40, thus providingr a stop position that is uniformly the same' under all forms of line spare movements. This stop-member' 4:8 carries a space-.filling block 49 that swings towards the pinion and is timed to enter the cavity or gap 37, and when saidstop-member 48 strikes the face of the pinion 40, said block will have entered the gap 37 with the lower edge resting against the betteln face ot the gap inthe top edge ot the loose clutch-member 32 and the upper edge thereof in contact with the under face of the bracket section 17, as clearly shown in Figures 4 and 5. At the end of the movement of the sector 4,1, the loose clutch-member 32 becomes positively locked into toothed engagement with the fixed clutchmember Q9 to prevent platen overthrow, or independent movement lic-- tween these two clutch-members.

It will be noticed ithat the foregoing dctailed description includes a mechanism that may be assembled and finally adjusted within the bracket'sections 17 and 18. It. may be adjusted to the carriage end as a unit. b v the setting of only a few screws, either at the factory or in the repair field.

The driving.;r connection includes the platenshaft 11, projecting from its bearing in the left-hand carriage end, and the spiral gear 49 secured thereto for engagement with the spiral pinion c `The transmission of motion from the pinion 27 to the gear 49 tends to spring the platensl1aift 1.1. out 0i' aligna Mfr liti-l lili l il'.

messe i t'o provide a bearing for the Shaft ll'zitlja'tcent the gear position thereon. The free end of the 'shaft 1l Indy be provided Witllthe iisiialfingerdnob 50 for forcing tliepllteii'troelle m either? dimeem'i at will fm far as d@- sired andir'ldependen'tljyy of the line-Spacing lV 51; l. l

The details of the drivingconectioii frb'in the line-space lever 51 tothe p'inioiiidriving sector 41 Willnow be deseribedg this mech'- anisin ineludingv the niieroineter device for` adjueting thelength ofthe lln'epaee iinit. The linespcing lever 51 is fulcrumetl to the lisiial lug 52 of the carriage end a's upon a screw 53 threaded therethrotigh With a` sec'- tion 53 projecting above the face of theliig to passthrogh a Barrel section of the linespaee lever. The lever 51 is formed with lug 5l'adjaeent the fleriiln of the level', and Withiilthis lug a rectangiilar opening 55 isA pi'iovided,v to receive reqtiare block for a limited microscopio sliding `:vidjustrneht -Within the opening towarde or freni the fulcruni of the lever. The bloek has a pivotal connection to one 'end of a link 57, and hy adjusting or setting the block Within 'the pning55 towards or from the axis of the lever 5l,` mintitelvx'fI variable movements ny be transmitted to theflink' or push-'bar by the line-space lever. y

The connection between the block and the baii 57 Consists f a stild 58 formed With il thin flange 59 intermediate its length that divides the stiid into tivo straight shiik vsections,y one on either `side ofthe flainefe;` one ehnk tobe driven thronglia eentrl .hole in the block 5G up `to the flange, .and the other shank Section passing throngh a pivot hole in one end of the bar 57 to project above theV face thereof and enter afspira'l groove 6,0 formed in the under" face of a knurled, gg'r`z`ttli1-V ated di'kfhj rotatably `niotinted uponthe free end of theftili'uni screiv 53 and held nntler tension against the line-space lever 5l by a spring 63 compressed by the screw 62 threaded into the end i the lilcrllin Screiv `53. The opposite end of the pusliebar 57 has a pivot li'ole therethrough to receive a stud 54: riveted to and extendingr downwardly from the iinder face of the sector 4l a sullicient disV tance to maintain operative' Connection Vwith seid `har at both case-shift positions of tlie platen. I The stud shifting up and down -with the platen fi'aniethe pivot `hole thronghthe bien 57i is inadeslightly larger than the dialneter of the sttid 64,c to provide yfor a free shift- .ingr` `movement of the stiid Without cramp-H in ,g Y l v The flange 59 of the stiid 58, as may he seen at FigiireLoverlaps the edges of the open- .shifti'ng Acauses a changein the adjustable stop ingA 55 to `retain the Block 56 iv'ltlii the openin# 55, andfpiidvides fdi'tlie simple assembly lieween the: line=spaelevt`r l aiitl the gear sector all of Ydrolpy'iing the -hlo'cl '56 into tlie opening adjusting one enc of the- CnneeL tion 57 to the stlid 58 and the "other eiid to the stud Gil, and adjlistllid thel liek 6l to the scretv 53 with the stud 5% Within the Spital groeve G0, and the lower face ef Said disk bearing against the eme ofthe bar 5T and the line-spatie lever 5l, and finally'threadilig the retaining screw Sainte the enti lV tliefhl: @ruin screw 58. e.

n will im understood emebyjremeiig the p thumb-"Wheel 6l, tliesnail cani groove 57'* is revolved, sinee Vsaid groove isinade in the" iindereurfa'ce of said fingerivvheel 6l. This y y gemeen of the driving stud 58 the link `Henle the stud may he set to mintitel'y variahletiistahees towards and from theiixis 53 ofthe line? space lever, and liencethe stroke ftlie linl" 57 may he varied Wit-hin Wide liniits,'hiit the variation ina)T he inicroseopi at any point to securehany desired linee-spatie: iiiiit. :VVhif the stud or' rest 58 isronce; set, it vwill IethalnV independently Where it is set and Will n 'eetl no attention' during the usal typing and line=l spacing operations, lint when it i desired toV reset into lengthen' er shorten the lineiepe:

ing unit, it is only nee'e'ssaj to revolve' the thumb-Wheel 6l aocoidiligly.` The friction spring G3 holds the thumb-'Wheel against accidental rotation.' A

The mmimmsm time far described pmvid'e Y for m line-spacing movement @lmet-die Y tan'ces, and to provideintilti 'les of the nit distance, means are niotlntetlJ iiage to varytlie' initial position of the lint.i space lever. This mecheiiisln inludcs leve? upon the cai- 65 plv-neat@ a` per@ ee `Sem-ima te the ringe-freine by screws Gig' said leve'arryin-g a-stud 67 to engage-the linespacelever as an on. the plate 66 and forihed With a seriesbf ,n

spirally arranged detehts 7l Within title of which the stud 68 will nest. These detente for the stud 68 may beinserbd te' iiidiate multiples of a -unit' liiieispaee distance that the linelspace lever inay be set, t, and toV facilitatey shiftingr of the detente `frelatively to said stud, atliuinli-piee 7 2 with a lintirletl *rd vary the position ef said tace is provided. vTo inaiiitain the studi GBT Within a detent, a lsp`rin`j7l is djlisted tween a pin 74 on the under side of the level" Y 65and an ear 75'on the late 66.

VTo restore the lever 5 and the parte con i neoted thereto, a. spring 76 ls einployed, hav# ingone vend secured to a 'stiid 77 on said lever.

and the other end attached at any con"v'etiientV place on the carriage-frame, as bja Sc'reiv 7 A l The liiie-space lever 51k is mounted upon the carriage-trame l5, and the parts operated bythe push-bar 57 .are mounted upon the shifting platenflira'nie 1Q, and to prevent any torsional strain in the platen-frame to disturb .the alignment of the platen to the printing elements due tothe line-space stopping feature between the gear sector stop 48 and the pinion 40, means are provided for a back support on the carriage to bear against a member of the paten-frame to resist any straintransmitted to the platen-carriage during a line-spacing operation. This means ma include a bracketf), adjustably secured to t ie carriage-trame. atany convenient place, as 4by. screws 80,'aiid'terminates at an uprightl section 8l with the edge face thereotl bearing against tie-rod 82 of the platen-frame.

Any abnormal*rearward movement of the fplaten-frame due to a line-spacing strain,

will be arrestedv by the section 8l at either case-shift position of the platen-carriage.

' It will befurther noted that the present y invention provides for a variable platen line-l space mechanism that may be operated in the usual manner by a line-space lever for tixedline-space unitdistances or multiples thereof; that the platen may be readily turned in either direction by the usual linger-knobs without interferencefrom the variable spacing members; that 'the platen may be "manually turned in either direction through minute distances independently of the line-space lever; that means are provided to automatically lock Vthe clutch-members in operative engagement just prior to the end of the line` spacev movement to prevent independent movementof the platen from any source at the end of a line-spacing operation; that the clutch-members are separated by a very light spring that does not add. material resistance to', the manual turning of the platen; that the braking element `for the loose clutchmember coacts against. the roughened periphery of said member and is also eilective under a light spring tension; and that the gear-sector carries astop to arrest the linespacing movement of the line-space lever and also carries means to arrest the line-spacing movement of the platen. s y It Will ,also be noted that instead of shipping a multitude of loose parts for assembly to. machines alreadyin use, the frame li', 18, 19 includes a factory assembled and adjusted unit that can be assembled to a machine as a unit; that the line-space lever with its fulcrum screw adjusting disk and the push-bai' maybe a factory-assembled unit also; that the plate 6,6, the lever 65, the detent lever G9,

, and its spring may also be a actoryeassembled product to be adjusted to the'inachine as a unit; and that the entire line-spacing mechanism can be shipped to branch oliices for assemblyy in three assembled units with l' l v u f, a tew simple instructionsthat can be readily understood by any repair-man familiar with thc Underwood typewriting machine.

Variations may be resorted to within `the scope of the invention, and portions ofthe improvements may be used without others.

Havingfthus described my invention, l claim:

v l. A typewriting machine including a revoluble platen, a line-space lever having alixed Julcruin, a slide movable upon said level' towards and away from the `fulcrlun of the lever and connected to the platen, to drive the same in line-spacing andmeans rotatably mounted upon the ulcruin of the line-space lever to adjust the slide microscopicallyto secure microscopic variations in the extent of the line-space unit of rotation of the platen for the saine extent oi' vibration of the lever.

2. A typewriting machine including a rev oluble platen, a line-space lever having a lixed fulcruni land formed with a slide-way radiating from the fulcruin thereof, a slide movable within the slideway towards and from the ulcrum of the lever and connected to drive the platen, and means mount ed to rotate about the fulcruin of the line space lever and operative to inicroscopically adjust and hold the adjusted .slide to elicct a microscopic variation in the extent of the line-space unit of thro1 of the slide to rotate the platen by a fixed line-spacing stroke of said lever. Y

A typewriting machine including a revoluble platen, a line-space lever having a fixed fulciuin, a slide adjustable upon said lever to vary the transmitted leverage to the platen, and means rotatably mounted and trictionally held upon the fulcrum of the linespace lever for microscopically adjusting-the slide and holding the adjustment vthereof to establish microscopic line-space units of rotation of the platen by the throw of the slide from a ixed normal position of said lever.

et. A typewriting machine including a revoluble fplaten, a line-space lever having a fixed yfulcrum, a slide housed `within said lever and slidable towards said fulcruin to vary the stroke of the slide, a platen-driving stud carried bythe slide, connections between the studand the platen, and carrying means rotatably mounted upon the fulcrum of the line-space lever and over the stud and operative to adjust the slide to secure microscopic variations in the line-space unit of throw of the stud to drive the platen from a line-spacing stroke of said lever that is uniformly the same for all adjustments of said stud.

5. A typewriting machine including a revoluble platen, a line-space lever having va fixed fulciuin, a slide movable towards and Yfrom the` ulcrum of said lever to vary the stroke ol' the slide relatively to a fixed throw of said lever, a platen-drivingr stud carried byr the slide and connected to line-space the the platen, a platen-driving stud carried by theslide, driving connections `between the stud and the platen, `and indexing means mounted to rotate about the iulcru'mof the line-space lever andro-operate with saidy stud to microscopically adjust the slide to.l secure microscopic variations in the extent-olf the line-space unit of rotation of the platen platen, and a scrollcamming means rotatably H mounted uponthe fulcrum of the linewspace 6. A typewriti'ng machine including a rev-v oluble platen, a line-space lever, a slide mov able upon the lever and connected to lthe platen, astud carried by the slide, and means rotatably mounted upon the'lineespace lever and includinga spiral groove to engage with the stud to adjust the slide and predetermine a` line-space unit of rotation for theplaten.

7. A typewriting machine incliulingg,` a revoluble platen, a l1ne-space lever, a slide mounted upon saidlever and connected to the platen, mechanism mounted upon the linev space lever to adjust theslide and predetermine a line-space unit, and meansto predetermine the sweep of the line-space lever for a linespacing movement oi the platen that is some multiple of the line-space unit;

Vv8. A typewriting machine including arevoluble platen, a `line-space lever, a slide mounted' upon Said lever and connected to the platen, mechanism mounted upon'the linespaee lever to adjust theelide and predetermine a. line-space unit, a vback stop for said lever, and means to shift thestop to predeten mine the sweep of the line-space lever 'for a line-spacing movement of the platen Ithat is some` multiple of `the linespace unit.

9. A typewriting machine including a revoluble platen, a line-space lever having a xed forward stop, a slide lmounted upon said lever and connected to the platen, mechanism mounted upon the line-space lever to adjust the slide and `predetermine a line space "unit, aback stop for said lever, and means' to adjust the back stop to predetermine the extent ofsvving for the line-space lever to the forward stop for a line-spacing movement of the platen that is some multiple ot the line-space unit.

l0. A typewriting machine including' a revoluble platen, a line-space lever having a fixed fulcrum, a slide adjustable on said lever to determine a line-space unit of rotation or ironia uniform sweep of theline-space lever. 11.@A typewriting `machine including a revoluble platen, a line-space lever, means settable to limit the swing o'f said lever for multiples of a line-space unit, a slide carried by said lever and connected `to the platen, and

means for minutely adjusting the slide relatively to said lever to determine a line-space unit of motion for the platen. v

l2. A typewriting Y machine including a revoluble platen, a line-space lever swing-able about a .fixed fulcrum to a lined Stop, a motion-transmitting element slidably Vmounted upon said lever and conneetedfto the platen, and means mounted upon the iulcrum ol said lever and settable independently thereof, to inicrometrically adjust the angular relation between the tin-nsmitting` element `and the line-space lever to secure micrometric variations inthe extent of throw of the platen from a lixed line-spacing throw of said lever. 13. A typ-ewritmg machine includi a carriage and a revoluble platen, aline-space Y lever, a motion-transmitting.element slidably mounted within said lever and connectedto the plateinmeans mounted upon .said lever and movable independently e thereof, to Vminutely adjust the angular relation between the transmittin element and the line-s nace lever topredetern'iinc a line-space unit of movement for the platen, and meansmountedv on the carriage to predetermine the swing of the line-space lever to rotate the platen a linespace distance equivalent to some multiple of the line-spaceunit. Y i I lil. A V typewriting machine including a revoluble platen, a line-,space lever, a normally inoperative plateirclutch including a pair el' toothed elements brought together by the line-space lever to rotate the platen, and moans to automatically loclr the clutch` members together at the end of a linespac` ing movement of the platen, to prevent inde; pendent. movement oi either clutch-element.

l5. A typewriting machine including a revoluble platen, a line-space lever, anormally inoperative platen-clutch includinga pair olf toothed elements brought .together by the line-space lever .to rotate the platen, and means carried by the line-spacelever and brought into co-operation by the swing of the line-space lever to interlock with the clutch` elements and arrest the platen at? the end oi' a line-spacing movement, said clutch-'elements self-releasingl to permit thefplaten to remain stationary during the return of theline-space lever. 1 .Y 16. A typewritiiig machine including` a revoluble platen, a line-space lever, a normally inoperative platen-clutch including a pair of separated ltoothed elements brought to! gether by the line-space movement of said. lever to drive the platen, andrmeans brought into positionby the line--sjiacinp movement oi thelever that interlock 'with the clutch-elements at the end of a line-spaeing` stroke to lau positively prevent rotation fof the platen in. l

either direction.

17. vA typewriting machine including' a revoluble platen and a vline-space lever, `a nor` lau fil

member permanently connected to the platen and the other member slidably connected to the line-space lever, means actuated b the initial swing ofthe line-space lever to tiring the sliding clutch-member into clutching'eugagement with the fixed clutch-member, and means tinally brought into position by the line-space levr in line-spacing the platen, to maintain the interlock between the clutchmember and positively check the line-spacing momentum oi the platen.

18. `A typewritingmachine including a revoluble platen, a. normally inoperative4 platenclutch, a line-space lever, mechanism operated by the line-space lever to render the clutch operative to rotate the platen at the initial movement of the lever, and means automatically brought into action during the linespacing of the platen, to prevent rotation of the platen independently oi' the line-space lever.,

19. A typewriting machine including a revoluble platen, a normally inoperative platenclutch, a line-space lever, mechanism actuated by the initial movement oi the lever to render the clutch operative to rotate the platen, and means actuated by the lever and timed to the line-spacing movement of the platemto interlock With the clutch and pre r vent rotation oi the `platen, independently of the line-space lever.

20. A typewriting machine including a revoluble platen, a normally inoperative platenclutch, a liner-spacelever, mechanism actuated by the initial movement of the lever to render the clutch operative to rotate the platen, and meansactuated by the lever and timed to the line-spacing movement ot the platen, to interlock With the clutch to prevent rotation of the platen in either direction at the end of the line-spacing operation.

2l. A typewriting machine including a revoluble platen, a line-space lever, a gear-sector driven by said lever, a pinion rotated by the sector, a normally inoperative two-part clutch having one part connected to the pinion and the other part connected to the platen, mechanism to render the clutch operative to rotate-the platen, and means carried by the sector to lock the tivo clutch-members together, at the end ot a line-spacing operation.

Q2. A typewriting machine including a revoluble platen, a line-space lever, a gearfsector actuated by said lever, a pinion rotated by the sector, mechanism driven by the pinion to rotate the platen, a stop on the sector to arrest the line-spacingswing of the linespace lever, and means carried by the sector to arrest the line-spacing movement` of the platen.

A typewriting machine including a revoluble platen,-a` line-space lever, a gear-sector actuated by said lever, a pinion rotated by the sector, mechanism driven by the pinion to rotate the platen, a stop on the sector to arrest the linespacing swing of the line-space lever,

and means carried by the sector to simultaneously arrest the line-spacing movement of the line-space lever and arrest the line-spacing movement oi the platen.

2i. A typewriting machine including a revoluble platen and a platen-shaft, a line-space lever, a gear-sector actuated by said lever, a vertically-disposed spindle, a pinion rotatable about the spindle and driven by the gearsector, a normally inoperative two-part clutch, one part secured to the pinion and the other part secured to the spindle, reduction-gearing connecting the spindle to the platen-shat't, mechanism operated by the pinion to render the clutch operativeto rotate the platen, and means carried by the sector to positively lock the two clutch-members together during the line-spacing operation.

25. A typewriting machine including a revolublc platen and a. platen-shaft, a line-space lever, a gear-sector actuated by said lever, a vertically-disposed spindle, a pinion rotatable about the spindle and driven by the. gearsector, a normally inoperative two )art clutch, one part secured to the inion an the other part secured to the spin le, reductiongearing connecting the Spindle to the platenshaft, mechanismoperated by the pinion to render the clutch operative to rotate the platen, and means carried by the sector to arrest the platen at the end et a line-spacing movement.

26. A typewriting machine including a rev oluble platen and a platen-shaft, a line-space lever, a gear-sector connected to said lever, a vertically-disposed spindle, a pinion loose on the spindle and driven by the gear-sector, a two-part clutch, one part iixed to the spindle and the other part loose on the spindle, re duction-gearing connecting the s indle to the platen-shaft, means carried by t ie pinion to ring the two clutch-members into clutching engagement to rotate the platen, and means carried by the loose clutchanember to co-operate with the gear-sector to lock the two clutchmembers together, at the end of the linespac ing operation.

27. A typewriting machine including a revoluble platen and a platen-shaft, `aline-space lever, a gear-sector connected to said lever, a vertically-disposed spindle, a pinion loose on the spindle and driven by the gear-sector, a two-part clutch, one part fixed to the spindle and the other `part loose on the spindle, re-

duction-gearing connecting the spindle to the platen-shaft, means carried by the pinion to lim lll

bring the two clutch-members into clutching engagement to rotate the platen, a recess formed in theloose clutch-member, and means carried by the gear-sector and timed to enter the recess to lock the two c1utchmembers together, at the end of the line-spacing operation. A y

28. A typewriting machine including a. revoluble platen and a pIatenshat, a line-,space two-part clutch, one part ixed to the spindle and the other part loose'on the spindle, reduction-gearing connecting the spindle to the platen-shaft, means carried by the pinion to ybring the two clutch-members into clutching engagement to rotate the platen, a recess formed in the loose clutch-member, and means carried by the gear-sector and timed to the rotation of the loose `clutch-member to enter said recess and arrest the movement of' the line-space lever.

29. A typewriting machine including a revoluble platen and a platensshaft, a linespace lever, a ear-sector connected to said lever, a ventica ly-disposed spindle, a pinion looseon the spindle and driven by the gearsector, a two-part clutch, one part fixed to the spindle and the other part loose on the spindle, reduction-gearing connecting the spindle to the platen-shaft, means carried by the pinion to bring the two clutch-members into clutching engagement to rotate the platen, a recess formed in the loose clutch-` e member, and means carried by the gearfsector and timed to the rotation of the loose clutch-member to enter said recess and simultaneously arrest the movement of the linespace lever and lock the two clutch-members together to arrest the rotation of the platen. 30. A typewriting machine including a revoluble platen and a platen-shaft, a linespace lever, a gear-sector connected to said lever, a spindle, a pinion loose on the spindle and driven by said sector, means connecting the spindle to the platen-shaft, a two-part clutch mounted upon the spindle, one part fixed to the spindle and the other part loose upon the spindle and normally inoperative to the other part, and means rotated by the pinion to render the clutch-elements operative, including a .brake engaging the periph` ery of the loose clutch-member to prevent rotation thereof until said loose clutch-member is iii-st brought into clutchingengagement with the clutch-member fixed to the spindle.

31. A typewriting machine including a carriage and a shifting platen-frame mounted therein, a line-space ever mounted upon the carriage, a line-spacing mechanism mounted upon the platen-frame and operated by said lever, and means mounted upon the vcarriage and co-operative with' the platenframe to prevent a rearward distortion of the alignment of the platen from a line-spacing operation.

32. A typewriting machine including a carriage, a platen and a platen-driving rack, and a line-spacing mechanism wholly assem`v bled within a frame and secured to the carriage as a unit', to co-operate withnsaid rack to rotate the platen.

33.` A typewriting machine including ,a

\ carriage, a platen, a platen-driving rack and aline-space lever, and a line-spacing mechanism including a train of toothed elements assembled within a frame and secured to the carriage as a unit, to co-operate with said rack and line-space lever. i

34. A typewriting machine including a carriage, a platen, a platen-driving rack and a line-space lever, and a line-spacing mechanism including a train of multiplying and reduction gearing connected by a clutch, assembled within a frame and secured to the and operated by the line-space lever.

35. In a typewritingmachine, means for minutely varying the extent of forward stepb y-step line-spacing movements of -a revoluble platen, including a line-space lever,'a microscopically adjusted driving stud upon the lever, a drive train connecting the stud to the platen to drive the latter forwardly repeatedly a single line-space that microscopically varies in extent according to the variation in -intial position of the line-space lever relatively to the fixed stop'to predetermine some multiple of the line-space unit.

BURNHAM C. STICKNEY.

4carriage as aunit, to co-operate with the rack v